US3736950A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Anti-contamination vent valve
Assignee: Dover Corp
•
Filing: 1971-07-12
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Granted: 1973-06-05
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Expires: 1991-07-12
Abstract
Abstract An anti-contamination vent valve for preventing fluid escape to a vent line is disclosed. The valve provides for the venting of fumes from an enclosure to a vent line under normal conditions. The valve provides a closure member for preventing excess fluid from the enclosure escaping into the vent line and thereby contaminating the vent line or other enclosures which may be connected with the common vent line.
Inventors
- 👤 D Smallwood
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 19:33
CPC Classifications
F; F16; F16K; F16K24/00; F16K24/04; F16K24/042; F16K24/044; F16K24/046; F16K1/00; F16K1/14; Y; Y10; Y10T; Y10T137/00; Y10T137/2931; Y10T137/3003; Y10T137/3084; Y10T137/309; Y10T137/3099; Y10T137/7287; Y10T137/7358; Y10T137/7423; Y10T137/7426; Y10T137/7436; Y10T137/7504; Y10T137/7613
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
235 words
An anti-contamination vent valve for tanks comprising in combination a casing detachably mounted to the top of the tank, said casing having an inlet port and an outlet port, the inlet port being in communication with the interior of the tank; an open cage mounted in said casing between said inlet port and said outlet port, said cage defining an inlet end smaller in diameter than said casing inlet port diameter to define a space therebetween and extending partially therethrough, said inlet end terminating in a seating surface; a float; a pair of U-shaped elements connected to the cage inlet end defining an open float supporting structure to support said float upstream of said seating surface wherein said float extends into the tank interior and is responsiVe to fluid level in the tank wherein vapors normally pass through said cage inlet end and whereby fluid is prevented from passing therethrough when said float is seated against said seating surface; a seal mounted on said cage to cooperatively engage the interior of said casing thereby forming a fluid seal between said cage and said casing and said cage inlet end having a continuously open aperture therethrough downstream of said seating surface, said aperture permitting communication between the tank and said casing outlet port through the space defined between said cage inlet end and said casing inlet port when said float is seated against said seating surface.
Claim 2
Dependent Claim
235 words
An anti-contamination vent valve for tanks comprising in combination a casing detachably mounted to the top of the tank, said casing having an inlet port and an outlet port, the inlet port being in communication with the interior of the tank; an open cage mounted in said casing between said inlet port and said outlet port, said cage defining an inlet end smaller in diameter than said casing inlet port diameter to define a space therebetween and extending partially therethrough, said inlet end terminating in a seating surface; a float; a pair of U-shaped elements connected to the cage inlet end defining an open float supporting structure to support said float upstream of said seating surface wherein said float extends into the tank interior and is responsiVe to fluid level in the tank wherein vapors normally pass through said cage inlet end and whereby fluid is prevented from passing therethrough when said float is seated against said seating surface; a seal mounted on said cage to cooperatively engage the interior of said casing thereby forming a fluid seal between said cage and said casing and said cage inlet end having a continuously open aperture therethrough downstream of said seating surface, said aperture permitting communication between the tank and said casing outlet port through the space defined between said cage inlet end and said casing inlet port when said float is seated against said seating surface.
Claim 3
Dependent Claim
67 words
The valve according to claim 1 in which said casing has an opening opposite said inlet port to permit removal of said cage, one end of said cage being threadably formed to cooperatively engage the opening in said casing and thereby support said cage from said opening, and further comprising an externally threaded cover for mounting in the casing opening above said cage to seal the opening.
Claim 4
Dependent Claim
36 words
The valve according to claim 2 in which said cage and said cover each has a handle respectively mounted thereto for ease in insertion and removal of said cage and cover respectively from said casing opening.
Claim 5
Dependent Claim
28 words
The valve according to claim 3 in which said inlet end protrudes into the tank whereby an air space is defined above the level of the seating surface.
References Cited (Backward Citations)
GB189603875A
Cited
US2049340A
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US3236493A
Cited
US3247862A
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US3367362A
Cited
US3450206A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-06-04 | 1976-12-04 | 1977-06-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-04 | 1980-12-04 | 1981-06-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-04 | 1984-12-04 | 1985-06-05 | $7700.00 | Window Closed / Lapsed |